Measuring and instructional ruler

Details Measuring and instructional ruler Measuring and instructional ruler

G - Physics

01

B

G01B 3/02 (2006.01) G01D 13/12 (2006.01) G09B 1/02 (2006.01) G09B 19/02 (2006.01) G09B 19/12 (2006.01) G09B 19/24 (2006.01)

Patent

CA 2450716

A measuring and instructional device containing a base panel having a top surface and perimeter bounded by at least one edge, with the top surface having evenly spaced apart linear rulings perpendicularly disposed to the edge and defining a non-linear standard unit of measure; and a top transparent sheet having a top surface and a perimeter bounded by at least one edge, wherein the top transparent sheet top surface has evenly spaced apart linear rulings perpendicularly disposed to the long edge of the top transparent sheet and defining fractional increments of the non-linear standard unit of measure; wherein the transparent sheet is positionable over the base panel so that the fractional increments of the unit of measure may be aligned with the units of measure to demonstrate the relationship between the unit of measure and the fractional increments thereof.

L'invention concerne un dispositif pédagogique de mesure contenant un panneau (110) de base qui présente une surface supérieure et un périmètre délimité par au moins un bord (118). La surface supérieure comporte des traits espacés régulièrement et perpendiculairement au bord qui définissent une unité de mesure non linéaire standard ; et une feuille supérieure transparente qui présente une surface supérieure et un périmètre délimité par au moins un bord, la surface supérieure de cette feuille supérieure transparente comportant des traits (151) espacés régulièrement et perpendiculairement au bord long de ladite feuille qui définissent des fractions de l'unité de mesure non linéaire standard ; la feuille transparente peut être placée sur le panneau de base de façon à aligner les fractions de l'unité de mesure sur les unités de mesure afin de montrer le rapport entre ladite unité de mesure et lesdites fractions.

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